<template>
    <div class="play-bar" :class="{show:!toggle}">
        <div @click="toggle=!toggle" class="item-up" :class="{turn: toggle}">
            <svg class="icon">
                <use xlink:href="#icon-jiantou-xia-cuxiantiao"></use>
            </svg>
        </div>
        <div class="kongjian">
            <!-- 上一首 -->
            <div class="item" @click="prev">
                <svg class="icon">
                    <use xlink:href="#icon-ziyuanldpi"></use>
                </svg>
            </div>
            <!-- 播放 -->
            <div class="item" @click="togglePlay">
                <svg class="icon">
                    <use :xlink:href="playButtonUrl"></use>
                </svg>
            </div>
            <!-- 下一首 -->
            <div class="item" @click="next">
                <svg class="icon">
                    <use xlink:href="#icon-ziyuanldpi1"></use>
                </svg>
            </div>
            <!-- 歌曲图片 -->
            <div class="item-img" @click="toLyric">
                <img :src="picUrl"/>
            </div>
            <!-- 播放进度 -->
            <div class="playing-speed">
                <!-- 播放开始时间 -->
                <div class="current-time">{{nowTime}}</div>
                <div class="progress-box">
                    <div class="item-song-title">
                        <div>{{this.title}}</div>
                        <div>{{this.artist}}</div>
                    </div>
                    <div ref="progress" class="progress" @mousemove="mousemove">
                        <!-- 进度条 -->
                        <div ref="bg" class="bg" @click="updatemove">
                            <div ref="curProgress" class="cur-progress" :style="{width:curLength+'%'}"></div>
                        </div>
                        <!-- 拖动的点点 -->
                        <div ref="idot" class="idot" :style="{left:curLength+'%'}" @mousedown="mousedown"
                             @mouseup="mouseup"></div>
                    </div>
                </div>
                <!-- 播放结束时间 -->
                <div class="left-time">{{songTime}}</div>
                <!-- 音量 -->
                <div class="item item-volume">
                    <svg v-if="volume == 0" class="icon">
                        <use xlink:href="#icon-yinliangjingyinheix"></use>
                    </svg>
                    <svg v-else class="icon">
                        <use xlink:href="#icon-yinliang1"></use>
                    </svg>
                    <el-slider class="volume" v-model="volume" :vertical="true"></el-slider>
                </div>
                <!-- 收藏 -->
                <div class="item" @click="collection">
                    <svg :class="{active:isActive}" class="icon">
                        <use xlink:href="#icon-xihuan-shi"></use>
                    </svg>
                </div>
                <!-- 下载 -->
                <div class="item" @click="download">
                    <svg class="icon">
                        <use xlink:href="#icon-xiazai"></use>
                    </svg>
                </div>
                <!-- 当前播放的歌曲列表 -->
                <div class="item" @click="changeAside">
                    <svg class="icon">
                        <use xlink:href="#icon-liebiao"></use>
                    </svg>
                </div>

            </div>
        </div>
    </div>
</template>
<script>
    import {mapGetters} from 'vuex'
    import {download, setCollect} from '../api/index'

    export default {
        name: 'play-bar',
        data() {
            return {
                nowTime: '00:00',        //当前播放进度的时间
                songTime: '00:00',        //当前歌曲总时间
                curLength: 0,            //进度条的位置
                progressLength: 0,      //进度条的总长度
                mouseStartX: 0,      //拖拽开始位置
                tag: false,             //拖拽开始结束的标志，当开始拖拽，它的值才会变成true
                volume: 50,             //音量，默认一半
                toggle: true            //显示隐藏播放器页面
            }
        },
        computed: {
            ...mapGetters([
                'id',               //歌曲id
                'url',              //歌曲地址
                'isPlay',           //播放状态
                'playButtonUrl',   //播放状态的图标
                'picUrl',            //正在播放的音乐的图片
                'title',                  //歌名
                'artist',                 //歌手名
                'duration',                //音乐时长
                'curTime',                //当前音乐的播放位置
                'showAside',            //是否显示播放中的歌曲列表
                'listIndex',            //当前歌曲在歌单中的位置
                'listOfSongs',          //当前歌单列表
                'autoNext',             //自动播放下一首
                'loginIn',              //用户是否已登录
                'userId',               //当前登录用户的id
                'isActive',             //当前播放的歌曲是否已收藏
            ])
        },
        watch: {
            //切换播放状态的图标
            isPlay() {
                if (this.isPlay) {
                    this.$store.commit('setPlayButtonUrl', '#icon-zanting')
                } else {
                    this.$store.commit('setPlayButtonUrl', '#icon-bofang')
                }
            },
            curTime() {
                this.nowTime = this.formatSeconds(this.curTime)
                this.songTime = this.formatSeconds(this.duration)
                this.curLength = (this.curTime / this.duration) * 100
            },
            //音量变化
            volume() {
                this.$store.commit('setVolume', this.volume / 100)
            },
            //自动播放下一首
            autoNext() {
                this.next()
            }
        },
        mounted() {
            this.progressLength = this.$refs.progress.getBoundingClientRect().width
            document.querySelector('.item-volume').addEventListener('click', function (e) {
                document.querySelector('.volume').classList.add('show-volume')
                e.stopPropagation()
            }, false)
            document.querySelector('.volume').addEventListener('click', function (e) {
                e.stopPropagation()
            }, false)
            document.addEventListener('click', function () {
                document.querySelector('.volume').classList.remove('show-volume')
            }, false)
        },
        methods: {
            //提示信息
            notify(title, type) {
                this.$notify({
                    title: title,
                    type: type
                })
            },
            //控制音乐播放、暂停
            togglePlay() {
                if (this.isPlay) {
                    this.$store.commit('setIsPlay', false)
                } else {
                    this.$store.commit('setIsPlay', true)
                }
            },
            //解析时间
            formatSeconds(value) {
                let theTime = parseInt(value)
                let result = ''    //返回值
                let hour = parseInt(theTime / 3600)    //小时
                let minute = parseInt((theTime / 60) % 60) //分钟
                let second = parseInt(theTime % 60)        //秒
                if (hour > 0) {
                    if (hour < 10) {
                        result = '0' + hour + ':'
                    } else {
                        result = hour + ':'
                    }
                }
                if (minute > 0) {
                    if (minute < 10) {
                        result += '0' + minute + ':'
                    } else {
                        result += minute + ':'
                    }
                } else {
                    result += '00:'
                }
                if (second > 0) {
                    if (second < 10) {
                        result += '0' + second
                    } else {
                        result += second
                    }
                } else {
                    result += '00'
                }
                return result
            },
            //拖拽开始
            mousedown(e) {
                this.mouseStartX = e.clientX
                this.tag = true
            },
            //拖拽结束
            mouseup() {
                this.tag = false
            },
            //拖拽中
            mousemove(e) {
                if (!this.duration) {
                    return false
                }
                if (this.tag) {
                    let movementX = e.clientX - this.mouseStartX       //点点移动的距离
                    let curLength = this.$refs.curProgress.getBoundingClientRect().width
                    let newPercent = ((movementX + curLength) / this.progressLength) * 100
                    if (newPercent > 100) {
                        newPercent = 100
                    }
                    this.curLength = newPercent
                    this.mouseStartX = e.clientX
                    this.changeTime(newPercent)
                }
            },
            //更改歌曲进度
            changeTime(percent) {
                let newCurTime = (percent * 0.01) * this.duration
                this.$store.commit('setChangeTime', newCurTime)
            },
            //点击播放条切换播放进度
            updatemove(e) {
                if (!this.tag) {
                    //进度条的左侧坐标
                    let curLength = this.$refs.bg.offsetLeft
                    let newPercent = ((e.clientX - curLength) / this.progressLength) * 100
                    if (newPercent > 100) {
                        newPercent = 100
                    } else if (newPercent < 0) {
                        newPercent = 0
                    }
                    this.curLength = newPercent
                    this.changeTime(newPercent)
                }
            },
            //显示播放中的歌曲列表
            changeAside() {
                this.$store.commit('setShowAside', true)
            },
            //上一首
            prev() {
                if (this.listIndex != -1 && this.listOfSongs.length > 1) {    //当前处于不可能状态或者只有只有一首音乐的时候不执行）
                    if (this.listIndex > 0) {                                 //不是第一首音乐
                        this.$store.commit('setListIndex', this.listIndex - 1)  //直接返回上一首
                    } else {                                                  //当前是第一首音乐
                        this.$store.commit('setListIndex', this.listOfSongs.length - 1)  //切换到倒数第一首
                    }
                    this.toplay(this.listOfSongs[this.listIndex].url)
                }
            },
            //下一首
            next() {
                if (this.listIndex != -1 && this.listOfSongs.length > 1) {    //当前处于不可能状态或者只有只有一首音乐的时候不执行）
                    if (this.listIndex < this.listOfSongs.length - 1) {                                 //不是最后一首音乐
                        this.$store.commit('setListIndex', this.listIndex + 1)  //直接返回下一首
                    } else {                                                      //当前是最后一首音乐
                        this.$store.commit('setListIndex', 0)  //切换到第一首
                    }
                    this.toplay(this.listOfSongs[this.listIndex].url)
                }
            },
            //播放音乐
            toplay: function (url) {
                if (url && url != this.url) {
                    this.$store.commit('setId', this.listOfSongs[this.listIndex].id)
                    this.$store.commit('setUrl', this.$store.state.configure.HOST + url)
                    this.$store.commit('setPicUrl', this.$store.state.configure.HOST + this.listOfSongs[this.listIndex].pic)
                    this.$store.commit('setTitle', this.replaceFName(this.listOfSongs[this.listIndex].name))
                    this.$store.commit('setArtist', this.replaceLName(this.listOfSongs[this.listIndex].name))
                    this.$store.commit('setLyric', this.parseLyric(this.listOfSongs[this.listIndex].lyric))
                    this.$store.commit('setIsActive', false)
                    // if(this.loginIn){
                    //     getCollectOfUserId(this.userId)
                    //         .then(res =>{
                    //             for(let item of res){
                    //                 if(item.songId == id){
                    //                     this.$store.commit('setIsActive',true);
                    //                     break;
                    //                 }
                    //             }
                    //         })
                    // }
                }
            },
            //获取名字前半部分--歌手名
            replaceLName(str) {
                let arr = str.split('-')
                return arr[0]
            },
            //获取名字后半部分--歌名
            replaceFName(str) {
                let arr = str.split('-')
                return arr[1]
            },
            //解析歌词
            parseLyric(text) {
                let lines = text.split('\n')                   //将歌词按行分解成数组
                let pattern = /\[\d{2}:\d{2}.(\d{3}|\d{2})\]/g //时间格式的正则表达式
                let result = []                                //返回值
                //对于歌词格式不对的直接返回
                if (!(/\[.+\]/.test(text))) {
                    return [[0, text]]
                }
                //去掉前面格式不正确的行
                while (!pattern.test(lines[0])) {
                    lines = lines.slice(1)
                }
                //遍历每一行，形成一个每行带着俩元素的数组，第一个元素是以秒为计算单位的时间，第二个元素是歌词
                for (let item of lines) {
                    let time = item.match(pattern)  //存前面的时间段
                    let value = item.replace(pattern, '')//存后面的歌词
                    for (let item1 of time) {
                        let t = item1.slice(1, -1).split(':')   //取出时间，换算成数组
                        if (value != '') {
                            result.push([parseInt(t[0], 10) * 60 + parseFloat(t[1]), value])
                        }
                    }
                }
                //按照第一个元素--时间--排序
                result.sort(function (a, b) {
                    return a[0] - b[0]
                })
                return result
            },
            //转向歌词页面
            toLyric() {
                this.$router.push({path: `/lyric`})
            },
            //下载音乐
            download() {
                //需要等待从服务器加载完数据才会下载 很不友好
                //TODO 需要调整下载方式
                download(this.url)
                    .then(res => {
                        console.log('进行下载了')
                        let content = res.data
                        let eleLink = document.createElement('a')
                        eleLink.download = `${this.artist}-${this.title}.mp3`
                        eleLink.style.display = 'none'
                        //把字符内容转换成blob地址
                        let blob = new Blob([content])
                        eleLink.href = URL.createObjectURL(blob)
                        //把链接地址加到document里
                        document.body.appendChild(eleLink)
                        //触发点击
                        eleLink.click()
                        //然后移除掉这个新加的控件
                        document.body.removeChild(eleLink)
                    })
                    .catch(err => {
                        console.log('出错了')
                        console.log(err)
                    })
            },
            //收藏
            collection() {
                if (this.loginIn) {
                    let params = {
                        'userId' :this.userId,
                        "type" : 0,
                        "songId" : this.id
                    }
                    setCollect(params)
                        .then(res => {
                            if (res.code === 0) {
                                this.$store.commit('setIsActive', true)
                                this.notify('收藏成功', 'success')
                            } else if (res.code === 20000) {
                                this.notify('已收藏', 'warning')
                            } else {
                                this.notify('收藏失败', 'error')
                            }
                        })
                } else {
                    this.notify('请先登录', 'warning')
                }
            }
        }
    }
</script>
<style lang="scss" scoped>
    @import '../assets/css/play-bar.scss';
</style>
